Cochlea
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Synonyms
Definition
An important structure in the inner that is responsible for the analysis of sound.
Introduction
The cochlea is a snail-shaped structure in the inner ear and it is responsible to separate sound relating to frequency. Based on evidence from paleontological studies, cochlea seems to have been originated from the basilar papilla (hair-cell epithelium for hearing) of the stem amniotes such as lepidosaurs, archosaurs, and mammals. Further evidence of this statement is from a relative of the ancestors of land-living vertebrates, namely the “living fossil” coelacanth fish Latimeria chalumnae.
Structure of the Cochlea
The cochlea looks like a snail and is comprised of fluid-containing compartments in the form of a spiral, and it contains the organ of Corti, which is the receptor for hearing (Chang and Khana 2013). In humans the cochlea is about 2.5 turns and if it is uncoiled it reaches a length of 3.1–3.3 cm. Its height in humans is 0.5 cm and it...
Keywords
Cochlea Basilar Papilla Inner Hair Cells Basilar Membrane Lagenar MaculaReferences
- Balkany, T. J., & Brown, K. D. (2017). The ear book. A complete guide to ear disorders and health. Maryland: Johns Hopkins University Press.Google Scholar
- Chang, R., & Khana, S. (2013). Anatomy of the vestibular system: A review. NeuroRehabilitation, 32, 437–443. https://doi.org/10.3233/NRE-130866.PubMedGoogle Scholar
- Dooling, R. J., Leek, M. R., Gleich, O., & Dent, M. L. (2002). Auditory temporal resolution in birds: Discrimination of harmonic complexes. The Journal of the Acoustical Society of America, 112(2), 748–759.CrossRefPubMedGoogle Scholar
- Dooling, R., Leek, M., & Gleich, O. (2007). Chapter 1: Influence of neural synchrony on the compound action potential, masking, and the discrimination of harmonic complexes in several avian and mammalian species. In B. Kollmeier, G. Klump, V. Hohmann, U. Langemann, M. Mauermann, S. Uppenkamp, J. Verhey, D. Czeschlik, & J. Lindenborn (Eds.), Hearing – From sensory processing to perception (pp. 1–10). Berlin: Springer.Google Scholar
- Fritzsch, B. (1987). Inner ear of the coelacanth fish Latimeria has tetrapod affinities. Nature, 327(6118), 153–154.CrossRefPubMedGoogle Scholar
- Köppl, C. (2011). Birds–same thing, but different? Convergent evolution in the avian and mammalian auditory systems provides informative comparative models. Hearing Research, 273(1), 65–71.CrossRefPubMedGoogle Scholar
- Manley, G. A. (2000). Cochlear mechanisms from a phylogenetic viewpoint. Proceedings of the National Academy of Sciences, 97(22), 11736–11743.CrossRefGoogle Scholar
- Manley, G. A. (2010). An evolutionary perspective on middle ears. Hearing Research, 263, 3–8.CrossRefPubMedGoogle Scholar
- Manley, G. A. (2017). The mammalian cretaceous cochlear revolution. Hearing Research, 352(23–29.CrossRefGoogle Scholar
- Moller, A. R. (2013). Hearing. Anatomy, physiology, and disorders of the auditory system (3rd ed.). San Diego: Plural Publishing.Google Scholar
- Pickles, J. O. (2012). An introduction to the physiology of hearing (4th ed.). Bingley: Emerald Group Publishing Limited.Google Scholar
- Richardson, G. P., de Monvel, J. B., & Petit, C. (2011). How the genetics of deafness illuminates auditory physiology. Annual Review of Physiology, 73, 311–334.CrossRefPubMedGoogle Scholar